Mechanical movement



(No Mogel.)

HQWYMAN.l A

MECHANICAL MOVEMENT.

.UNITEDA STATES PATENT Crimen.

`V HORACE WYMAN, rOF WORCESTER, MASSACHUSETTS.

M ECHANICAL MOVEM ENT.

SPECIIEICATION'JM forrringipart of Letters Patent No. 264,594, dated September 19, 188.2. Application filed Augustlalsae. (No model.) i

To all whom tt may concern:

Be4 it known that I, HORACE WYMAN, of Worcester, county of Worcester, State of Massachusetts, have invented an Improvement in 5 Mechanical Movements, of which the following description, in connection withjthe accompanying drawings, is a specification..

My invention relates to mechanism for coni- Io rotaryv motion in one direction, or an intermitting oscillation in one and then in theopposite direction 5 alld my invention consists in a slidehar having one or more pivoted racks, which at suitable times may be turned'or swung aside to engage the teeth of agear connected with the shaft to which it is desired to impart a semi or partial rotation. rIhe gear employed will preferably have two series of teeth extending partially about its circumference, there heilig zo between each series of teeth, but at opposite sides of the gear, along narrow projection of a height equal to the height of the teeth of the series, and at one s ide ot' each ofthe said projections there is a toothless space as deep' as the depth of the spaces between the said teeth. The teeth of the gear, shaped as described, and the rack are so proportioned that when the teeth ofthe rack have lnoved the gear and shaft on which it is secured for the proper distance one ot' the toothless spaces on the gear Vwill arrive uppermost and permit the rack-teeth to run out of mesh with the gear and leave the latter, with its shaft, lat rest untilthe rack is again swung or moved about its pivot, so as to engage the longand narrow projection, which I shall denominate the engagingtooth,77 at one side of the spacein which the rack rested before it was turned aside. The reciprocations of therack when it rests in a toothless space do not affect the movement of the gear.' These shafts will preferably have attached to them cranks or eccentrics, or both, to co-operate by means oflinks with different portions of a lever, to move thesame at its ends over different distances, according as one or hoth'shai'ts are'moved at the same time; or, it' desired, the crank and eccentric might'be made to work directly in contact with portions of the lever suitably bored or slotted for such purpose. While 5o the shafts are not perfornling worky they will he held at rest by means of holders under control of springs, the said holder having dat feetJ to engage notched portionsof the peripheries of holding-plates secured to the said shafts.

To -avoid breaking the mechanism ill case the teethrof a rack-bar and the engagingtooth ofagear fail to properly mesh on the start, I

`have lnade the guides forthe slide-har and f rack so that they may yield. verting reciprocating motion into intermitting v Figure l represents in side elevation a suff- 6o ciellt portion ofmechanisnl. to illustrate my invention; Fig. 2,a left-hand end view of Fig.1; Fig.3,a detail of one of the holding-disks,with the foot o'f one of the holding levers or devices ill place upon the disk; Fig. 4,a section of one ofthe gears on one of the shafts, which are to` be turned for half a rotation and to be then left at rest. Fig. 5 represents a modification of the gear to be moved by the rack-har, and Figx a modified collstruction of rack-teeth,to 7o be described.

In the drawings, A represents the framework to support the working parts. B isa continuous rotating shaft, having at its end a crank, a, and crank-pin a', to enter a s1ot,a2,in 75 an ear, a3, connected with and shown as depending from the slide-bar C, held in slots in guide\vays c c, so that the said har will be reciprocated uniformly in' a straight line as the shaft alld crank-pin rotate. The slide-bar C 8o has pivoted upon it, at c2, as herein shown, two racks, c3 c, and the said racks, grooved at one side, as at 2, receive within the said slots one end of a rack-swinging device or' lever, d or r, pivoted at dV or r upon a stand, 0l2 or r2, the 85 foot of which is bolted to the frame-work A. The racks c3 c4'also extendv through the slots or spaces of the guideways cc, and beyond the said guideways the teeth at the under sides of the said racks engage the teeth of the 9o gear 19 lbelovT them, or'rest in a toothless space,

10, of the said gear. The shafts e and f, to be partially rotated and then left at rest foraJ longer or shortertime, are held in s'nitable bearings on theframe-Work. Shaft @,at itsrear 9 5 end, has upon it an eccentric, g, whichserves as the fulcrum for the lever cf-such alever as shown in my Patent No. 260,349, June 27,1882; The rear elld of the lever g' has attached to it a connectingrod, g2, the lower end of which roo is tted upon a crank-pill, g3, attached to the holding-plate f2, fast onthe shaftf. Shaft e has connected with it a holding-plate, e2. Each holding-plate e2f2 has its periphery notched or cut away at opposite sides its center, as shown best in Fig. 3, so as to leave shoulders 4 5 and 6 7, the shoulders 4 5 being nearest the outer face of the plate,while the shoulders 6 7 are nearest its inner face and the framework. The flattened port-ions of the plates extend somewhat laterally from the shoulders, so that the foot-pieces S of the holding devices m and r, both alike, pivoted at m or r upon the levers d or r, may move horizontally from between the shoulders, and yet continue to rest upon the plate, the withdrawal of a foot-piece from between the said shoulders being necessary before the plate and its carrying-shaft e or f can he rotated. In my patent referred to the shoe did not tit between shoulders, butsimply rested on a flat portion of the plates. The footpicces S are kept pressed down upon the holding-plates by spiral or other suitable springs, n, connected with the holding devices m r2, and the said devices derive their longitudinal movement, or movement from between the shoulders referred to, from the levers d and r, they in turn being moved at the proper time in any suitable manner, but preferably by wires d4, attached to fingers acted upon and moved by a pattern chain or surface. Each shaft e f has secured to its outer end a gear, p, of like construction, it having, as herein shown, except in Fig. 5, two series of teeth with six teeth in each series.

Viewing Fig. 1, it will be seen that there is a toothless space, 10, at the side of each gear between each series of six teeth referred to-a space equal in distance to about the space which would be covered by the teeth of the size of those employed on the gear p. The gear p (see the section, Fig. 4, at the righthand end of the space 10) has al1 engagingtooth, 12, madeas a longtoothless projection; but at the opposite side of the shaft carrying the said gear the engaging-tooth 13 is at the left of the toothless space 10, and thus it will be seen that the engaging-tooth 12 is located close to one face or side of the gearp and the tooth 13 close to the opposite face, and that the teeth 12 13 are also diametrically opposite each other.

In Fig. 1 it will be assumed that it is desired to partially rotate shaft e. In that iigure the engaging-tooth 12, at the right-hand end of the toothless space 10, referredto, is uppermost, and it must be engaged by the rst tooth of the rack-bar c3. 'lo insure this it will be supposed that the rack-bar has just been turned out to the right, as in Fig. 2, by the movement of the lever d. Now, if the slidebar C be moved in the direction of the arrow near it in Fig. 1 the teeth of the rack-bar will engage tooth 12 and rotate the gearp and shaft c in the direction of the arrow on it in Fig. 1 until the toothless space at the opposite side of the said gear and in line with the tooth 12 arrives uppermost, when the rack and gear will run out of mesh and the further rotation of shaft e will be stopped. When the leverd was moved to turnthe rack-bar into the position Fig. 2 it acted to push the holding device m from between the shoulders 6 7 and placed the foot-piece 8 upon the broad part of the periphery of the plate c2, which latter, in its revolution, brings its shoulders 4 5 next the outer face ot' the plate uppermost, linst as the toothless space 10 opposite tooth 13 is brought into position for the rack to run out of mesh with the teeth ot' the gear p, on shaft e, the foot-piece 8, ot' the holding device m, then dropping between the shoul ders 4 5 of the plate, locking it and retaining the shaft e in place. Furtherlongitudinal reciprocations of the slide and rack bar will not turn or affect the shaft e, and when it is next to be turned the rack-bar must be swung about its pivot c2, or to the left far enough to remove its teeth from the spacelO and place the said teeth in line with the engaging-tooth 13. at the left of the space 10, then uppermost, when the said tooth will be engaged by the teeth of the rack-har, and the gear p and shaft c will be again rotated a semi-rotation and be again left at rest. The rack-bar c4 operates in like manner with the gearp on shattf, and is operated by the lever r, like lever d, referred to as being employed to move the rack-bar c3.

The holding device having a foot, 8, employed with the holding-plate fz, is lettered r2. The guideways o have their upper arms, 14, pivoted at l5, and the said arms are acted uponbysprings 16, controlled, as to their pressure, by adjusting-screws 17, so that iu case the rack-bar and teeth engage improperly when about to be moved together the said arms 14.

will rise and obviate breakage of parts.

' I do not desire to limit my invention to the exact devices employed to move the rack-bars about their pivotal pointez, as other well-known equivalent mechanism may be employed.

As thus far described, all the teeth of the rack-har being of equal breadth, it is possible TOO IIO

to move the gearp in one direction at one u movement of the rack-bar, and in the opposite direction at the return movement of the rack-bar, the latter, however, being moved laterally, as described, between each reciproca tion.

If desired, the rack-bar may be so made as to prevent the gear p from being turned, eX- cept in one direction. To secure such action, the end tooth first to come opposite the en gaging-teeth 12 or 13 must be made suciently broad to prevent the rack from being moved laterally while the rack-bar is traveling in that direction of its reciprocation but as the last tooth of the rack-bar to pass the gear p 'moves beyond ther said gear the rack-bar may be vibrated to meet the engaging-tooth and turn the gear as the rack-bar is reciprocated in the opposite direction.

Viewing Fig. G, the rackbar is shown as pro.

IZO

vided with abroad tooth,V 18, at its free end, and so made that the rack-bar can engage and move'the gearp only when the rack-bar is re-4 ciprocated in the direction of the arrow on itl By the term broad .tooth 77I in that igure. mean a tooth which. inthe direction of the length of the rack-bar occupies the-space of two or more teeth. The broad tooth, by its contact with the side of tooth 12 or 13, prevents lateral movement otl the rack-bar, except in certain defined positions.

1f desired, the gear p, asin Fig. 5, may havel its two en ga gin g-teeth, 12 13,in the same plane or line, in which case, to leave the said gear at rest, the ra ck-bar would have to beimmediately shifted or moved laterally before the rack-bar started on its return' movement, and in such A modilication the shoulders would be removed from the holding-plate, and they would be made as in my patent referred to. i.

In another application 4I have shown a reciprocating bar arranged' to co-operate with a pinion,some of the teeth of which, by their longitudinal movement, are placed in position to be engaged by the rack-bar.

The leveng has a strap, p, attached to'it, (shown in Fig. 1,) which may support a coun# terbalancing-weiglt, as in my Patent'No. 260,349, June 27, 1882.

Ifclaiml. The gear having two series of teeth and two intermediate' engaging-teeth, combined with'the reciprocating rack-bar adapted to engage'the engaging-teeth and then the gearteeth in line with them to turn the said gear a semi-rotation, substantially as described.

2. The shaft, its gear provided with two series of teeth, toothless spaces, and engagingteeth, combined with a reciprocating rack-bar, and with means to move the rack-bar both longitudinally and laterally, to voperate sub- Aeratethe said shafts, substantially as and for the purposes described.

4. The shaft e, its attached`holding;plate provided with shoulders nearits opposite side edges and at opposite sides ofthe said shaft, combined with the holding devices having feet adapted to rest upon the said plates and enter between the shoulders, as and for the purposes set forth.- i

5. The gears and the rack-bars, and means to reciprocate the latter, combined with a yielding gudeway to permit the rack-bars to yield when not .properly engaged with the teeth of the gear, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of twosubscribing witnesses.

HORACE WYMAN.

Witnesses Y i' J. B. SYME, G. W. GREGORY. 

